Furnace



l 20 the invention,

t Patented Jan. 1,l 1935 1,986,668 FURNA'CE Carl A. Maxwell, Teaneck, N.J., assigner Ato Fuller Lehigh Company, New York, `N. Y., a corporationof Delaware Application March 81, 1981,`seria1 No. 526,625

V'11 claims. (o1. 122-6) :My invention relatesto furnaces, particularlyfurnaces having Water cooled walls. The invention is especially usefulin, connection with furnaces in which fuel is burned in finelycomminuted condition and in which high temperatures are produced.

One object of the invention is to provide support for the water coolingsystem of a furnace wall. A second object is to provide restrainingmeans` against lateral movement of a furnace Wall. A further object isthe provision of such support and such restraint in a manner which willpermit limited horizontal movement of the wall. Other objects will beapparent upon conl5 sideration of the following specification:

f One form of the invention is illustrated in the accompanying drawing.in which- Figurepl is a vertical section through the lower part of afurnace constructed in accordance with Fig. 2 is a section on the linelI-lI of Figure 1, Fig. 3 is a section on the line III--IlI through oneof the supports shown in Figure Yl, and.

` Fig. 4 is a section on the line IV-IV of Fig. 3. The furnace showncomprises a floor 10 which is illustrated as formed of refractoryJmaterial.

Walls 11 are provided which limit the horizontal' extent of the furnace,and water tubes 12 are disposed in the walls for coolingl the same. The30 water tubes in each wall extend below the floor and terminate in aheader 13 in the plane of the wall, which lies in a substantiallyhorizontal position. One such header is employed in con- 3 nection withech wall.

for each header 13, horizontal movement being provided for in any knownor convenient manner,

' for instance, by means of rollers. i As hereillustrated a rollersupport in the form of a ballv 40 bearing support is provided for eachheader. Thus, in the present construction, the headers 13 rest in one ormore saddles 15 and a horizontal plate 16 supports each saddle. Ahorizontal bedplate 17 lies beneath the first-named plate, and

45 bearing balls 18 are carried upon the bed-plate supporting thefirst-named plate 16 with its load. It will be obvious that the supportis adapted to carry the header and permit movement in substantially anyhorizontal direction, since the balls 1 50 roll upon the bed-plate andpermit the horizontal plate 16 which carries the saddle l5 `to rollover" 5 may roll. Furthermore, the horizontal saddle- A horizontallymovable support 14 isprovided carrying plate 16 has downwardly `turnedflanges 19, which will limit the extent of its travel over. the balls,at the same time affording some vpro'- tection against falling grit anddirt entering .the space occupied by the balls. 5

-Resilient restraining means are associated with each header and tend tomaintain the wall against the floor and to prevent movement of theheader y outwardly from the furnace. Obviously, a variety of such meansmay be employed to produce this 10 effect. p

VIn4 the present` embodiment the resilient ref straining means take theform of a spring, and as here illustrated, two springs 20 are providedhaving a strap 21 passing through their centers and surrounding theheader 13 whose movement they restrain. The springs act in compressionby bearing upon the flange 22 of a member supporting the furnace wall10, as will be apparent at once from inspection of the accompanyingdrawing. In the event of expansion of the furnace oor, or of anymaterial resting upon it, outward movement of the furnace walls will bere-` strained by means of the'resilient restraining means described..The walls are held against expansion of the oor by means of thesprings, and bear against the seals. Should the thrust overcome thesprings, the walls will be able to move in ahorizontal direction withoutdeection or distortion ofthe tubes. Y

-From the foregoing, it will be evident that the invention isparticularly' useful in connection with slag tap furnaces, and it willbe seen that the drawingillustrates sucha furnace.

I do not consider the embodiment described and illustrated in thenaccompanying drawing as limiting my invention, since it is presentedmerely to indicate how the invention maybe employed; With thisunderstanding, therefore,

I claim: Y 40 1. In 'a'furnace for burning a slag-forming fuel, abottom, bottom supported side walls enclosing said bottom, means formaintaining said side walls in contactwith the edgesof said bottom touprevent leakage of slag between said bottom .and

said walls, separate supports for each of said side Walls and for saidbottom, and means cooperating with said supports to permit outwardmovement of the walls resulting fromhorizontal expansion of said wallsand said bottom while a leak-preventing contact between said walls andsaid bottom is maintained.

2.- In a furnace for burning a slag-forming` fuel, a bottom adapted tosustain a pool of molten slag, bottom supported side walls enclosing 60body said bottom, means for continuously maintaining -said side walls innonleaking contact with said bottom, supports for said bottom, andsepa-- rate rolling supports for each of said walls.

3. Fluid heat exchange apparatus constituting va slag tap furnace andcomprising, bottom' supheaders facilitating expansion movements of theheaders in any horizontal direction, a refractory slag tap furnace floorpositioned between, the

walls and above said headers, separate supports for said oor, and springactuated devices acting directly on the headers to tend to pull themagainst the marginal portionsof the oor, said spring devices tending tomaintain a slag tight joint between the floor and said walls to preventleakage of slag maintained in a pool on the oor of the furnace.

4. Fluid heat exchange apparatus constituting a slag -tap furnace andcomprising, a refractory oor for maintaining a body of slag in thefurnace, a support for the oor, separate headers at opposite sides ofthe floor, rolling supports for the headers, furnace walls extendingupwardly froml the headers and including wall tubes connected therewith,and spring means acting on one of said headers to exert a force inwardlyof the furnace on the superposed furnace wall, each header supportingthe superposed wall in contact with the slag body.

5. Fluidheat exchange .apparatus constituting a slag tap furnace andcomprising, a bottom supported furnace wall including a row of fluidconducting wall tubes, a header for said wall having the lower endsv ofthe tubes connected thereto, separate rolling supports for said headerfacilitating expansion movements of the header in any horizontaldirection, a refractory slag tap furnace floor, separate supports forsaid floor, and spring actuated devices acting to tend to pull the wallinwardly of the furnace and against a marginal portion of the floor,said spring devicesv tending to maintain a slag tight joint between thefloor and said wall to prevent leakage of slag maintained ina pool onthe floor of the furnace.

6. Fluid heat exchange apparatus constituting a slag tap furnace andcomprising a refractory floorfor maintaining a bodyof slag in thefurnace, a support for the floor, a wall tubev header at the side of theiioor, rolling supports for the header, a furnace wall extendingupwardly from the header and including wall tubes connected therewith,and spring means acting on the header to exert a force inwardly of thefurnaceon the superposed furnace wall, the header supporting thesuperposed wall in contact with the slag 7. .Fluid heatexchangeapparatus constituting a slag tap furnace and comprising, bottomsupported furnace walls including rows of uid conducting wall coolingtubes, separate headers for said walls having the lower ends of thetubes connected thereto, separate rolling supports for said headersfacilitating expansion movementsof the headers in any horizontaldirection, a refractory slag tap furnace floor positioned between andcontacting with the walls, separate supports for said floor, and springactuated devices acting on the walls to tend to pull them inwardly ofthe furnace and against the marginal portions of the hoor, said springdevices tending to maintain a slag tight joint between the floor andsaid walls to prevent leakage of slag maintained inl a pool on thefloor'of the furnace. y

8. In a slag tap boiler furnace, bottoin supported furnace wallsincluding refractory covered wall cooling tubes, a header connectedtolthe lower ends of the tubes of each wall so as to'support the tubesand the walls, a refractory slagsupporting door located between thewalls and having a slag tight juncture with each wall, supports for the.floor, separate rolling supports for the headersv permitting each headerto move horizontally independently of the floor, and restraining meansto keep the walls in close contact with the floor.

9. Fluid heat exchange apparatus constituting a slag tap furnace andcomprising, bottom supported furnace walls including rows of fluidconducting wall tubes, separate headers for said walls having the lowerends of the tubes connected thereto, separate rolling supports for saidheaders facilitating expansion movements of the headers in anyhorizontal direction, .a refractory slag tap furnace floor positionedbetween the walls, separate supports for said floor, spring actuateddevices acting on the walls to tend to pull them inwardly of the furnaceand against the marginal portions ofthe floor, and means anchoring thespring devices to the floor supports, said spring .devices tending tomaintain a slag tight joint between the floor and said walls ta preventleakage of slag maintained in a pool on the floor of the furnace.A

10. In a slag tap boiler furnace, bottom supported furnace wallsincluding refractory covered wall cooling tubes, a header connected tothe lower ends of the tubes of each wall so as to support the tubes andthe walls, a refractory slag supporting oor ,located between the wallsand having a slag tight juncture with each wall, xed supports for thefloor, rolling supports for the headers independent of the floorsupports, means fory periodically allowing accumulated molten slag toflow from the furnace, and restraining means to keep the walls in closecontact with the floor.

1l.` In a slag tap furnace, a refractory oor adapted to support a poolof molten slag, a wall. water tubes in said Wall for cooling the same,said water tubes extending below said floor, and a header in Athe vplaneof. the wallin which said water tubes terminate, roller support for saidheader and restraining means keep the wall in close contact with thefurnace oor.

'- CARL A. MAXWELL.

